There have been a number of high-profile firings / forced resignations / etc in recent years originating from the Trump administration. Some of these, such as John Bolton, have ended up as media headlines

How does the number of presidential appointees which have resigned (or been otherwise removed) during his administration, as well as the rate at which other government officials have left their posts at the President's request, compare to past administrations?

This question is something of a duplicate of this question asked in 2018; however, as that question (and answer) are two years old now, I am interested in an answer with more current information (2020).